Fiber rope



ay e, 1924. n 1,492,977

T. GORE ET AL FIBER ROPE Filed April 28. 1923 INVENTORS Hamas Gore 21g/belt 5f 0. Zan/S011 A TTORNE Y Patented May 6, 1924.

UNITED STATES PATENT OFFICE.

THOMAS GORE, 0F BROOKLYN, NEW YO'RK, AND ROBERT S. O. LA'WSON, OF JERSEY CITY, NEW JERSEY.

FIBER ROPE.

Application llled April 28, 1923. Serial No. 635,239.

To all whom it may concern:

Be it known that we, THOMAS GORE, a citizen of the United States, and a resident of New York city, in the borough of Brooklyn,county of Kings, and State of New York, and ROBERT S. O. LAWSON, a citizen of the United States, and a resident of Jersey City, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in Fiber Rope, of which the following is a specification.

This invention relates to fiber ropes and has for its main object the production of a rope having greater strength and durability than fiber ropes heretofore manufactured by customary processes.

It is a well known fact that the strands of fiber ropes, as ordinarily constructed, become elongated when' subjected to stress as a result of which the load is carried by less than the entire rope. The elongation of the strands is due to the untwisting action of the yarns with relation to each other that comprise the strand. It has been proposed to overcome this defect by using the socalled slivers or untwisted fibers as the core of the stand but, obviously, untwisted fibers are not so stron as twisted arns.

The main feature o this invention is to prevent or minimize the elongation of the strands without sacrificing the use of the advantageous twisted yarn.

Accordingly, the invention consists of the hereinafter described features of construction, several embodiments of which are disclosed in the accompanying drawings.

In said drawings:

Fig. 1 is a view in elevation, with parts broken away, of a length of liber rope em- -bodying one form of the invention.

Fig. 2 is a cross sectional view of Fig. 1 on the plane of line 2 2 of Fig. 1.

Fig. 3 is a view -in elevation of a single strand of the rope shown in Figs. 1 and 2 with parts broken away.

Fig. 4 is a cross sectional view on the plane of line 4 4 of Fig. 3.

Fig. 5 is a view in elevation of a piece of twisted yarn.

Fi 6 -is a view in elevation of a modified orm ofstrand stripped to show successive layers.

Referring to Figs. 1 to 5 inelusive, 6 indicates a fiber rope composed of a plurality of twisted strands 7. Each strand is constructed as follows: A plurality of twisted yarns 8 constitute an inner layer or core. These yarns are laid parallel to each other, preferably in straight relation. This core or layer is then served with a plurality of twisted yarns 9 laid spirally around' the core. The yarn used for the core and covering is shown in Fig. 5 and consists of fibers twisted together.

It will now be understood that the different layers of the strand, i. e. the core and covering, owing to the difference in lay, will oppose each other so that the tendency to untwisting and elongation of the strand is nullified or minimized.

In Fig. 6 is shown a different method of building up a strand in which is employed seven layers of fibers 10 all having different angles of lay. 4 It will be understood that the several layers may be laid in the same or in the opposite direction.

In both forms of the invention shown it will be seen that the covering yarns of each strand have a shorter itch than do the core yarns, and also that t e length of the core an tendency to untwist is opposed.

e claim:

1. A. fibre ro e composed of a plurality of strands twiste toget er, each strand comprising7 a plurality of individually twisted core yarns surrounded by a plurality of individually twisted coverin yarns laid at an angle to the core yarns, t e covering yarns having a shorter pitch of lay than the core yarns, and the length of thevcore yarns, in a given length of strand, being less than that of the covering yarns.

2. A fibre rope com osed of a plurality of strands twisted toget er, each strand comprising a plurality of individually twisted core yarns laid in parallel relation with respect to each other and surrounded by a plurality of individually twisted covering yarns laid at an angle to the core yarns, the covering yarns having ashorter pitch of lay than the coveringyarns, and the length of the core yarns, in a given; length of strand, being less than that of the covering yarns,

3. A fibre rope composed of a plurality of 5 strands twisted together, each strand comprising a plurality of individually twisted core yarns laid in straight parallel relation with respect to each other and surrounded by a pluralityv of individually twisted cover- 10 ing yarns laid at an angle to the core yarns. 4. A fibre rope composed of a plurality of strands twisted together, each strand com prising arplurality of individually twisted yarns arranged in a plurality of 1ayers,the covering yarns having a shorter pitch oi lay 15 than the core yarns and the length of the core yarns, in a. given length of strand, being less than that of the covering yarns.

Signed atNew York city in the county of New York and State of New York this 25 20 day of April, 1923. Y

THoMAs GORE. ROBERT s. o. LAWSON. 

